Which anatomical term refers to the middle of the thorax anteriorly?

The term that refers to the middle of the thorax anteriorly is "sternal." This term is derived from the word "sternum," which is the flat bone located in the center of the chest. The sternal region is significant as it represents the area where the ribs attach to the sternum, forming a critical part of the rib cage that protects vital organs such as the heart and lungs.

The umbilical term refers to the navel or belly button area, which is located on the anterior abdomen, not the thorax. Tarsal pertains to the ankle region and is not related to the thorax at all. The vertebral term refers to the spine or vertebrae, which is located posteriorly and does not describe an anterior thoracic structure. Thus, sternal is accurately used to specify the central area of the thorax in anatomical terminology.